September 27, 2013

Big Story Weather – September 27, 2013

by editor

redOrbit Meteorologist Joshua Kelly

Big Story Weather from September 26:

The snow continued to fly over the Northern Rockies with some places seeing an additional foot of snow. Rainfall was heavy along the Pacific Northwest leading to flood watches as well. A cool, dry pattern was in place over most of the East, while Florida also began to dry out. Severe weather was very limited with no major events.

Big Story Weather Discussion for September 27:

Surface Map: High pressure over the Northeast will dominate the weather with partly cloudy skies. This will extend from the Mid-Atlantic into the Ohio River Valley and southwards over the Southeast and Gulf Coast. Low pressure moving through the Rockies will bring another day of showers and thunderstorms for the Plains. The Rockies will be dealing with another day of low elevation rains and higher elevation heavy snowfall with many warnings in place. The Pacific Northwest will see a continued surge of moisture over the region.

Severe Weather: Limited to the Northern Plains.

Winter Weather: Another snowy day across the Rockies with places seeing an additional foot of snow possible.

Flooding: There is still potential flooding over portions of Central Florida and now a large area of potential flooding over portions of the Pacific Northwest.

Tropical Weather: We are now watching a wave moving across the Western Atlantic for possible tropical development. Winds are currently around 20kts and pressure of 1009mb. The storm has a low chance of developing at this time.

Winds: There will be strong winds over the Western portions of Nebraska, Kansas and into the foothills of Colorado. Winds in some places could hit 40-50mph.

Select City Forecast:

Baltimore MD: Partly cloudy with a high near 71F and overnight lows near 57F.

Dallas TX: Partly cloudy and warm high temps around 85F and overnight lows near 77F.

Sioux City IA: Partly cloudy this afternoon with a few thunderstorms overnight. High temps around 80F and overnight lows near 70F. Total overnight rainfall around 0.65 inches.

Boise ID: Cloudy with periods of heavy rainfall. High temps near 51F and overnight lows near 46F. Total rainfall around 1.25 inches.

Portland OR: Cloudy with periods of heavy rainfall. High temps around 55F and overnight lows near 50F. Total rainfall around 1.75 inches.

September 27, 2013 Storm Tracker Update:

Eastern Pacific Ocean: Low pressure moving into Alaska will bring heavy rainfall and snowfall to the region. Low pressure moving over the Rockies will also bring heavy rainfall and snowfall to the region. Low pressure off the coast of Central America is also being watched for possible tropical development over the next 24 hours.

Atlantic Ocean: Low pressure moving along the Eastern seaboard will continue to move away from land and be no impact. Low pressure near the Cape Verde Islands will bring another day of showers and thunderstorms to the region. A tropical wave in the Western Atlantic is being watched for possible tropical development .

Western Pacific: Tropical Storm 20W is moving towards Vietnam this morning with winds around 30kts and pressure near 1000mb. This storm is forecasted to gain strength over the weekend before making landfall. Two other areas over the basin are also being watched for possible tropical development. Low pressure moving near the Kuril Islands will bring heavy rainfall to the region along with gusty winds.

Indian Ocean: A fairly tranquil day across the basin with no major weather issues expected outside of the afternoon thunderstorms.

Southern Hemisphere: Low pressure to the south of the Fiji Islands will bring increased rainfall to the islands. Low pressure moving towards South America will bring increased winds and rainfall along with isolated snow showers to Southern Chile and Argentina. A strong area of low pressure moving south of Africa will bring gusty winds and showers to South Africa. Low pressure moving towards Southwest Australia will bring showers to Perth.

Five-Day Storm Index Outlook for September 27- October 1:

Baltimore MD: The region will start out impact free as high pressure dominate the area. By the 30th an area of thunderstorms will bring a slight impact to the region.

Dallas TX: The period will start impact free. The remainder of the period will have moderate impacts due to thunderstorms.

Sioux City IA: There will be thunderstorms on the 28th bringing slight to moderate impacts to the region. The remainder of the period will be impact free.

Boise ID: The period will start out with showers and then again around the 30th another round of showers will bring slight impacts to the region.

Portland OR: The next five days will see moderate impacts as heavy rainfall moves through the region.

Climate Watch Almanac for September 22-26:

Baltimore MD: The period started with temps around 1-7 degrees below normal and then briefly warmed to around 4 degrees above before falling back to around 1 below.

Dallas TX: The region started with temps around 1-2 degrees below followed by a strong warming period with temps around 2-12 degrees above normal.

Sioux City IA: The past five days have been warm with temps around 2-17 degrees above normal.

Boise ID: The period has seen temps around 3-21 degrees below normal.

Portland OR: The past five days have been cool with temps around 7-13 degrees below normal.

Major Weather Impacts Discussion for September 27, 2013:

Day 1-3: High pressure over the Eastern United States will keep most of the region dry and cool. This air mass should extend over most of the Great Lakes southward into the Southeast and the Gulf Coast. Low pressure moving into the Plains will bring showers and thunderstorms to the region. Look for higher elevation snows over the Rockies. The Pacific Northwest is going to see ample moisture flowing in from the Pacific. Day two high pressure will remain over the East Coast as the low pressure moves into the Western Lakes and extends to the Gulf Coast. This will bring an increase in showers and thunderstorms. High pressure will settle in over the Rockies bringing nice weather to the region, while the surge of moisture continues to push in over the Pacific Northwest. The period will end with the Northwest dealing with lots of rainfall.

Day 4-7: The period will start with low pressure moving into Maine and Canada bringing showers to the region along with gusty winds. A tropical wave will take shape near Puerto Rico and high pressure will dominate a good portion of the United States. Another weak frontal boundary will approach the Pacific Northwest. The middle of the period will have high pressure back over the Eastern US, while a potent storm system moves into the Northern Plains. A tropical wave will be moving near Southern Florida. The period will end with high pressure along both coasts and a strong low pressure moving into the Great Lakes.

Day 8-12: The period will start with low pressure extending from the Great Lakes into the Gulf Coast. Look for strong storms along the Gulf Coast giving way to showers over the north. High pressure will be over the Southwest, while another storm system moves into the Pacific Northwest. Day ten a storm system will move into the East Coast bringing showers to the region. The period will finish with a pretty zonal flow over the US.

Long Range Outlook: The period will start with high pressure dominating the entire country except for the Pacific Northwest where another storm system will be moving into the region. The period will finish with high pressure over a good portion of the US, while a strong low pressure moves into Alaska.

Today's Spotlight Cities Forecast:

Sioux Falls SD: Mostly cloudy with showers. High temps around 82F and overnight lows near 51F. Total rainfall around 0.50 inches. Saturday partly cloudy with a high near 66F and overnight lows near 45F. Sunday partly cloudy and warmer with a high near 74F and overnight lows near 53F. Monday partly cloudy with high near 80Fv 53F. Tuesday partly cloudy with a high near 76F and overnight lows near 50F.

New Orleans LA: Partly cloudy with a high near 88F and overnight lows near 70F. Saturday partly cloudy with a high near 86F and overnight lows near 70F. Sunday partly cloudy with a high near 84F and overnight lows near 67F. Monday partly cloudy with a high near 85F and overnight lows near 72F. Tuesday partly cloudy with afternoon thunderstorms. High temps around 85F and overnight lows near 70F. Total rainfall around 0.25 inches.

Los Angeles CA: Partly cloudy with a high near 78F and overnight lows near 62F. Saturday partly cloudy with a high near 83F and overnight lows near 60F. Sunday partly cloudy and a high around 78F and overnight lows near 57F. Monday partly cloudy with a high near 76F and overnight lows near 59F. Tuesday partly cloudy with a high of 76F and overnight lows near 57F.

Ask The Weatherman for September 27, 2013:

Question: What is horizontal wind shear?

Answer: When we are talking about wind shear, we are most concerned about this for flight operations. If there is strong horizontal wind shear, it could have implications in takeoffs and landings and also general flight levels as the airplanes would have to possible fly through this layer of strong winds to get to another flight level and can lead to turbulence.

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Green Energy Weather Report for September 27, 2013:

Wave Energy: There will be moderate amounts of energy along the Northeast, the Mid-Atlantic and the Southeast. The Gulf Coast will see light amounts of energy. The West Coast will see moderate amounts of energy from north to south.

Hydro Energy: The majority of the short term energy will be over the Eastern Rockies and into the Plains. Long term energy will be over the Rockies.

Solar Energy: There will be ample amounts of solar energy from the Northeast to the Great Lakes extending into the Southern Plains, Gulf Coast, the Southeast and the Southwest including parts of the West Coast. There will also be ample amounts of energy over portions of the Northern Plains ahead of the cold front.

Wind Energy: The wind energy today will be greatest over parts of Western Kansas and Nebraska. A second area will be over the Pacific Northwest.

September 27 Weather and Your Wallet (Fargo ND):

Strong low pressure moving into the region will provide ample amounts of rainfall to the area. The potential exists for over one inch of rainfall.

Dining: Today will be an excellent day to take your lunch to work or eat indoors with the potential for heavy rainfall all day.

Transportation: There will be impacts on the highways due to heavy rainfall and also at the airports as the heavy rainfall will slow down air traffic for the area.

Shopping: If you have shopping plans you might want to include the umbrella.

Electricity: The clouds and rain are going to keep the region cool. Expect to see around 9 HDD’s on the day. The heaters may need to kick in overnight.

Yard Work: Today will not be the best day for doing any of that type of yard work.

Construction: Today will be an indoor project kind of day. Expect to see delays to any outdoor projects.

Outdoor Venues: Rain check Friday for the area. Look for many outdoor events to be canceled. If you plan on taking a walk at the park with the pet make sure to take that umbrella.